Psoriasis is an inflammatory disease that affects the skin, nails and occasionally the joints as well. Psoriasis presents on the skin as red plaques with dry whitish thick scales that may flake off. These plaques can occur anywhere on the body, and can be particularly thick and unsightly on the scalp. Psoriasis can result in considerable psychological distress as it is a chronic condition that is often aggravated by illness or stress. Nail changes include nail pitting, lifting off of the nail from the nail bed (onycholysis) and changes in colour of the nail plate. There are now many available treatment modalities for psoriasis, depending on the severity of disease and whether there is associated joint involvement. These include topical therapies, phototherapy, oral medications and medications injected into the skin, muscle or vein.